O.K. so your putting a P120 and new bypass into the T33, maybe you should just try this new set-up first before pulling anymore hair out over this problem. It would be surprising to me if the fuz is stretching, (paint bubbling etc. would be suggestive of this) its way more likely a linkage/servo??? IMHO. Tams pipe would not be the cause either! I presume it is of the correct diameter/size/length for the RAM 1000 and JMP T33? For your model to be getting so hot at idle only? would indicate to me a air flow concern more than likely caused by the incorrect inlet/bypass installation or incorrect placement of your turbine within this set-up, restricting air cooling flow through bypass and pipe....

Aptar if you plan to continue running this set-up again, why not try posting some pics here of your T-33 by-pass and pipe installation, that way we can maybe offer somewhat more accurate verdict on this problem.... : )

Cheers